驱动中的ioctl方法和open、close、read、write方法一样，都是可以操作底层硬件的，对硬件的读写操作一般可以通过read、write方法来完成。-Driving the ioctl methods and the open, close, read, write, method, can be operation of the underlying hardware, the hardware of the general method can read, write, read and write operations to complete.